Yes but it's realistic. One of the beggest fears in humans is aging and that fear is amplified when you're around younger people and especially a younger lover.
The uke isn't spending his entire day depressed because of it but it crosses his mind and I think it's realistic...
Although I do get it. I like it when main characters find ways to deal with their insecurities and try to see past them, instead of just relying on others to give them confidence. Since in real life that can be pretty heavy to have to deal with for the other party. And I mean, of course everyone has their insecurities and you can't always be entirely rational when dealing with them, but.. Idk, it's just so much more inspiring to see someone try.
The only thing I didn't like very much was how the uke sometimes spoke about himself because of his age. Calling yourself disgusting because of something like that is not going to make anyone happy.